Mike Perry:
+ Leveraging the work done on TorBirdy, we can distribute Instantbird and Tor (and related components) in a single package, or as a combined addon. + Use Tor Launcher as the controller (sukhe recently added Thunderbird support) + Will allow seamless zero-configuration Tor usage for normal case, and will share Tor Browser's future Pluggable Transport support with no additional effort. + See the TorBirdy manual for more information: https://trac.torproject.org/projects/tor/wiki/torbirdy#TorBirdywithTorandTor...
I'd like to add that we can probably also leverage the work done on using Mozilla's updater in TBB to perform automatic updates of an Instantbird bundle. -- Lunar <lunar@torproject.org>